Please explain why you think the gmail user should get to keep the private bank account data.
The user did nothing wrong. They didn't solicit the data. Unless there's evidence to the contrary, they didn't use it for malicious activity. They may not even know they have it. They should not have to hire an attorney to protect their rights when they did nothing, let alone did nothing wrong.
The fact that the data was sent by electronic means shouldn't give the bank additional rights that they wouldn't otherwise have. If the bank had sent the data by fax machine or snail mail, should a court grant them a search warrant?
Please explain why it's more responsible for the bank to simply allow an anonymous person to have 1325 bank records than to file a court action to get the data erased.
The bank is already in the wrong for sending the data, unencrypted, to an unsecured e-mail address. They can't undo their wrong by bringing court actions against innocent third parties (Google and the Gmail user) for the bank's mistake.
And what's wrong with sealing records in a privacy-related court case?
Nothing, if you're suing to protect people. (In fact, the judge has ordered the e-mail address in question to be redacted from all court records.) Everything, if you're suing to protect your reputation. It's fine to redact the information of the people involved. It becomes a problem when you're trying to keep the entire action under seal.
If I were on that list of 1325 names, I'd want the data erased.
If you were on that list, I'd wager your actual reaction would be to remove your money and switch to a more trustworthy bank, and I'm certain that the other 1,324 accounts would feel the same way. Perhaps that's why Rocky Mountain Bank has gone to such great lengths to attempt, clumsily, to keep this a secret?
If the bank needed to go to court to accomplish this, I'd expect them to file suit.
You're not the only person whose rights are being violated in this case. Somebody should be looking out for the Gmail user's too. (Google isn't - they won't fight a court order regardless of how ludicrous it is.)
I'd want the court records sealed so I'm not publicly dragged into this.
Your information can be redacted without sealing the entire filing, and I have no objection to that happening.
And I'd also switch banks.
I'm glad.